1. http://www.crucial.com listed one unit, I'll leave it to you to look for the other.

2. About the hard disk. Always update the BIOS, but it's likely 32GB is the limit unless you use the disk extension tools that come with the drive. If this was me and I couldn't borrow the drive, then I'd stay under 32GB.

3. What OS? Many still run Windows 95 and some of those can only manage 8 GB.